If computer member of group

Hi,
I want to create a task to accomplish something that will depend on group membership of a computer.
I saw some reply that says to write it as below:

If {member of group 481 of sites} dos MSG * Group 481 ElseIf {member of group 482 of sites} dos MSG * Group 482 ElseIf {member of group 32 of sites} dos MSG * Group 32 Else {member of group 483 of sites} dos MSG * Group 483 endif

I’ve tried it in FixletDebugger but the error I get is:

Command failed (This expression contained a character which is not allowed.)

what is wrong with the syntax?
please help